Note 3 - Securities (Detail) - The Amortized Cost and Estimated Fair Value of Investment Securities (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Due in over one to five years	$ 6,430
Due in over one to five years	6,850
Due in over one to five years	5,019
Due in over one to five years	5,011
Due in over five to ten years	4,015
Due in over five to ten years	4,003
Due in over five to ten years	9,172
Due in over five to ten years	9,476
Due after ten years	7,879
Due after ten years	8,179
Agency mortgage-backed securities, residential	97,206	92,530
Agency mortgage-backed securities, residential	99,515	94,965
Agency mortgage-backed securities, residential	23,496	23,511
Agency mortgage-backed securities, residential	24,520	24,624
Total debt securities	97,206
Total debt securities	99,515
Total debt securities	23,496
Total debt securities	24,520
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Agency mortgage-backed securities, residential	88,172	91,521
Agency mortgage-backed securities, residential	90,501	93,953
Agency mortgage-backed securities, residential	15
Agency mortgage-backed securities, residential	$ 15

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS115-1/124-1

-Paragraph 7

-Footnote 2

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 19

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.